Classifications

• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
  • A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
  • A47L9/14—Bags or the like; Rigid filtering receptacles; Attachment of, or closures for, bags or receptacles
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
  • A47L11/40—Parts or details of machines not provided for in groups A47L11/02 - A47L11/38, or not restricted to one of these groups, e.g. handles, arrangements of switches, skirts, buffers, levers
  • A47L11/4013—Contaminants collecting devices, i.e. hoppers, tanks or the like
  • A47L11/4016—Contaminants collecting devices, i.e. hoppers, tanks or the like specially adapted for collecting fluids
  • A47L11/4019—Fill level sensors; Security means to prevent overflow, e.g. float valves
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L5/00—Structural features of suction cleaners
  • A47L5/12—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum
  • A47L5/22—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum with rotary fans
  • A47L5/225—Convertible suction cleaners, i.e. convertible between different types thereof, e.g. from upright suction cleaners to sledge-type suction cleaners
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
  • A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
  • A47L9/12—Dry filters
  • A47L9/122—Dry filters flat
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
  • A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
  • A47L9/14—Bags or the like; Rigid filtering receptacles; Attachment of, or closures for, bags or receptacles
  • A47L9/1427—Means for mounting or attaching bags or filtering receptacles in suction cleaners; Adapters
  • A47L9/1436—Connecting plates, e.g. collars, end closures
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
  • B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
  • B01D46/521—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material
  • B01D46/523—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material with means for maintaining spacing between the pleats or folds

Definitions

• the invention relates to a vacuum cleaner filter bag comprising a first bag wall comprising a filter material and a second bag wall comprising a filter material, the first and second bag walls being circumferentially interconnected such that the vacuum bag is completely closed, the filter material being the first and second Bag wall is formed of nonwoven fabric and wherein the vacuum cleaner filter bag has an inlet opening through which to be cleaned air can flow into the vacuum cleaner filter bag, and a holding plate.
• Vacuum cleaner filter bags are made today mainly from nonwovens. Due to their excellent dust holding capacity, vacuum cleaner filter bags made of nonwoven fabric filter bags made of paper, as they are known for example from US 3,596,443, almost completely displaced. The production of filter bags made of nonwovens is fundamentally different from the production of paper bags. Therefore, manufacturing methods and features of paper filter bags are generally not transferable to nonwoven filter bags.
• flat bags are most common. These are formed from a first or upper and a second or lower bag wall. Both bag walls can be welded together and / or glued together along their circumference by a seam. In the case of a rectangular flat bag, then four welds and / or glued seams form the connection between the first and the second bag wall.
• the hem can also be partially formed by merely folding a piece of filter material.
• the upper and the lower bag wall can be formed by folding a single piece of filter material along an axis of symmetry thereof and welding and / or gluing the two bag walls along the edges still open after folding.
• the first and the second bag wall by three welding and / or glued seams and connected a fold.
• first a tube are formed, which is perpendicular to this welding and / or adhesive seam by two more welding ß- and / or adhesive seams closed.
• the first and second bag walls are joined by two welding and / or gluing seams and two folds.
• the longitudinal welding and / or longitudinal adhesive seam may in this case lie either in the first or in the second bag wall (a special case of this embodiment would be that the longitudinal welding and / or longitudinal adhesive seam lies in such a way that it connects the first and the second bag wall; then the previously described case in which the first and second bag walls are joined by three welding and / or gluing seams and a fold).
• Such flat bags although nonwoven material is considerably more difficult to process per se, can be produced in a relatively simple manner.
• Flat bags are known, for example, from DE 201 01 466, EP 0 161 790, EP 0 639 061, EP 1 059 056 or EP 1 661 500.
• a disadvantage of these simple flat bags is that this bag type can only insufficiently adapt to the available space in the vacuum cleaner.
• folding is defined in the sense of the present invention as a sequence of two or more folds, wherein a single fold in the sense of the present invention is defined in each case by two fold legs and one fold hinge.
• FIGS. 12a, 12b and 12c show how side folds are formed according to the prior art.
• FIG. 12a shows a side fold 1200a, as disclosed in EP 1 683 460.
• the vacuum cleaner filter bag according to FIG. 12a consists of a first or upper bag wall 1201a and a second or lower bag wall 1202a. These two bag walls are connected by a weld 1203a.
• To form the side fold three folds I, II and III are provided. Both fold legs of the fold I 1210a and 121 1 a are formed by the first bag wall and the folding hinge Sl of the fold I lies in the first bag wall. Both fold legs of the folds III 1212a and 1213a are formed by the second bag wall and the fold hinge SIII of the fold III lies in the second bag wall.
• the first pleat leg of the pleat II 121 1a is formed by the first bag wall (and corresponds to the second pleat leg of the pleat I).
• the second pleat leg of the pleat II 1212a is formed by the second bag wall (and corresponds to the first pleat leg of the pleat III).
• the fold hinge Sil of the fold II runs along the weld 1203a.
• FIG. 12b shows a side fold 1200b according to DE 10 2008 006 769.
• the vacuum cleaner filter bag according to FIG. 12b consists of a first or upper bag wall 1201b and a second or lower bag wall 1202b.
• To form the side fold three folds I, II and III are provided.
• Both fold legs of the folds I 1210b and 121 1 b are formed by the first bag wall and the fold hinge Sl of the fold I lies in the first bag wall.
• Both pleat legs of the pleat III 1212b and 1213b are formed by the second bag wall and the pleat hinge SIII of the pleat III runs along the weld 1203b.
• connection between the first or upper bag wall of the vacuum cleaner filter bag and the second or lower bag wall of the vacuum cleaner filter bag is realized in the embodiment shown by a fold, namely the pleat II with its first pleat leg 121 1 b (corresponding to the second pleat leg of the pleat I) and its second pleat leg 1212b (corresponding to the first pleat leg of pleat III).
• FIG. 12c shows a further alternative for forming a gusset 1200c according to the prior art.
• the vacuum cleaner filter bag according to Figure 12c also consists of a first or upper bag wall 1201c and a second or lower bag wall 1202c.
• To form the side fold three folds I, II and III are also provided.
• Both pleat legs of the pleats I 1210c and 1211c are formed by the upper bag wall and the pleat hinge Sl of the pleat I lies in the upper bag wall.
• Both pleat legs of the pleat III 1212c and 1213c are formed by the lower bag wall and the pleat hinge SIII of the pleat III lies in the lower bag wall.
• the first pleat leg of the pleat II 1211c is formed by the upper bag wall (and corresponds to the second pleat leg of the pleat I).
• the second pleat leg of the pleat II 1212c is formed by the lower bag wall (and corresponds to the first pleat leg of the pleat III).
• the pleat legs of the pleat II and thus the upper and lower bag wall are connected by the folding hinge Sil with each other.
• the weld 1203a is located in the lower bag wall.
• Vacuum cleaner filter bags of various sizes can be folded together so that, despite their different dimensions, they can be offered in packages of the same dimensions, which leads to considerable advantages in terms of warehousing and offering in the showroom.
• DE 10 2007 060 748 discloses a filter bag in which the nonwoven material is stretched to form a three-dimensionally shaped bag wall.
• EP 1 982 625 discloses a filter bag, wherein the filter material is embossed at least in some areas and the effective filter area is increased by a profiling of the filter material. The profiling can be carried out in the form of elongated mutually parallel ribs. By memorizing one of the This pattern changes the material properties and / or the filtration properties of the embossed nonwoven layer.
• DE 20 2005 010 357 discloses a vacuum cleaner filter bag, wherein the bag wall has at least one layer of filter material, wherein at least one layer consists of creped fiber material.
• a coarse filter layer, a fine filter layer or all layers of the bag can be creped.
• creping the at least one layer is crumpled irregularly, wherein the volume per unit area of the respective filter layer is increased.
• By such a creping the basis weight of the filter layer and thus their filtration properties is changed.
• a disadvantage of the previously described vacuum cleaner filter bags is that the volume flow of air to be cleaned, which is conveyed through the vacuum cleaner, still decreases considerably as the degree of filling of the vacuum cleaner filter bag increases.
• the dust, ie the cleaning effect of a vacuum cleaner is so much lower in a partially filled vacuum cleaner bag as in a corresponding empty bag.
• This decrease in suction power is particularly strong in filter bags with a high degree of separation (high particle retention or low penetration).
• Object of the present invention is therefore to provide a vacuum cleaner filter bag through which decreases the volume of air to be cleaned, which is conveyed through the vacuum cleaner with increasing filling level of the vacuum cleaner filter bag slightly smaller than in a vacuum cleaner bag according to the prior art.
• the invention provides a vacuum cleaner filter bag having a first bag wall comprising a filter material and a second bag wall comprising a filter material, the first and second bag walls being circumferentially interconnected such that the vacuum bag is completely closed, the filter material being the first and second filter bags second bag wall is formed of nonwoven fabric, wherein the vacuum cleaner filter bag has an inlet opening, can flow through the air to be cleaned in the vacuum cleaner filter bag, a holding plate and in which the first and / or the second bag wall has at least five folds.
• surface folds can be provided on the surface of the first and / or second bag wall.
• the surface folding of the filter medium has considerable advantages. Due to the surface folding, the area flowed through is much larger than the regular area available for throughflow (inflow area). This can have several positive effects.
• the service life of the filter is extended proportionally to the area increase, as more filter material is available, can be stored in the dust.
• the service life is defined as the time after which a given filter resistance (pressure loss) is reached.
• the increase in the pressure loss is noticeable in the vacuum cleaner as a reduction in the volume flow (suction air flow) and ultimately as a loss of cleaning effect.
• the speed at which the filter medium flows through decreases.
• a media passage speed ratio of volume flow to flat bag flow area
• the bag wall is thus flowed through in about 0.019 s.
• a folded bag according to the invention having comparable outer dimensions may have a filter area of 2 x 300 mm x 630 mm.
• the result is a media passage speed of 9.3 cm / s and a flow-through time of 0.034 s.
• the lower media passage velocity results in a lower pressure drop across the filter medium, i. the initial volume flow (without dust loading of the filter bag) is higher than in a filter bag without the inventive folding.
• the intake power of the vacuum cleaner motor is more effectively converted into a high suction air flow.
• a vacuum cleaner motor with a lower power consumption can be used.
• each fold as the term is used in connection with the present invention, comprises two pleat legs and one pleat hinge.
• a fold hinge is understood to mean the point of a fold with the smallest radius of curvature. Through the imaginary connection of the fold hinges a so-called fold axis is obtained.
• the fold axis is also called pleat back.
• the fold axis may correspond to the longitudinal axis of a fold.
• Regions of a fold having a radius of curvature greater than the minimum radius of curvature of the fold are referred to as fold legs.
• the area lying between the pleat legs of a fold is referred to as a pleated core.
• the pleat legs of a pleat can thus in particular also have a curvature.
• Wrinkles can also have turning points.
• Turning points are those points of a fold, in particular the pleat legs, at which the curvature of the fold changes from concave to convex.
• a connecting line connecting several turning points of a fold is called an inflexion line (turning line).
• Two adjacent folds can also share a fold leg. If several folds are provided in this way, a fold package or a fold can be realized.
• Folds can also have legs that run parallel to the bag wall. Such legs may lie between folds that protrude from the bag wall plane and thus have an upstream opening with respect to the bag wall.
• the width of the parallel leg may be less than that, preferably less than half or more preferably less than a quarter of the width of the opening of the fold protruding from the bag wall.
• the pleat legs of the pleats of the first and / or second bag wall may in particular be smooth.
• smooth is meant here that the pleat legs have no densifications and / or structuring, in particular to stabilize the shape of the wrinkles.
• One or more pleat legs of one or more pleats of the first and / or second bag wall may comprise one or more embossed structures, in particular wherein the embossed structures are not used to stabilize the shape of the pleats. As a result, a further enlargement of the available area for filtration can be achieved.
• the first and / or the second bag wall may in particular have more than 5, 10, 20, 30, 40 or 50 folds, in particular also folds of these folds.
• the folds of the first and / or second bag wall may have a substantially regular spacing from each other. In other words, the distance between the fold backs of each two adjacent folds can be substantially constant.
• Folds can be lying or standing. Underlying folds are to be understood as folds whose fold limbs are arranged substantially parallel to the bag wall. Under standing folds are to be understood folds whose pleat legs with the bag wall at an angle greater than 0 ° and less than 180 °, in particular greater than 20 ° or greater than 45 ° include.
• a standing fold is also understood to mean a fold in which a plane in which both the fold axis and the fold line of the fold lie, with a flat, horizontal surface, is arranged on the first and / or second bag wall, an angle greater than 45 °, in particular greater than 30 °, in particular greater than 10 °.
• a lying convolution in this case can be understood as a convolution in which the plane with this surface encloses an angle smaller than 45 °, in particular smaller than 30 °, in particular smaller than 10 °.
• the vacuum cleaner filter bag for measuring or determining the above-mentioned angles, is arranged on a flat, horizontal surface.
• the vacuum cleaner filter bag can also be cut open and, in particular These are so arranged on the surface that the upstream side or inside of the original vacuum cleaner filter bag rests on the surface.
• Lying convolutions may be mutually overlapping, non-overlapping and / or partially overlapping.
• the folded nonwoven material may comprise one or more layers of nonwoven material. In particular, multiple layers of nonwoven material may be folded together.
• the bag wall may in particular also comprise or consist of a laminate of several layers, in particular two or more layers.
• the laminate may be a spunbonded filament spunbonded microfiber spunbonded nonwoven spunbonded nonwoven laminate (SMS laminate).
• SMS laminate spunbonded filament spunbonded microfiber spunbonded nonwoven spunbonded nonwoven laminate
• two or more meltblown nonwoven layers may be used (SMMS laminate, SnxMS laminate).
• the bag wall may comprise embossed nonwoven material.
• the retainer plate is generally considered herein to be an element of the vacuum cleaner filter bag used to hold the vacuum cleaner filter bag inside a vacuum cleaner housing.
• the holding plate may in particular be connected to the bag wall of the vacuum cleaner filter bag and arranged in the region of an inflow opening. It may be advantageous to compress the folds having bag wall in a first step, for example by Ultraschallverschwei tion, and in a second step to weld the holding plate.
• the holding plate is connected to a corresponding support member of the vacuum cleaner, in particular brought into engagement.
• the retaining plate can in principle have any shape.
• the holding plate can be designed as a planar, flat component as shown in EP 1 849 392.
• the retaining plate may also have a more complex structure, such as shown in DE 20 2008 006 904.
• the inflow opening and the holding plate can be arbitrarily positioned on the surface of the bag wall of the vacuum cleaner filter bag.
• the Flow opening and the holding plate centered on the vacuum cleaner filter bag can be arranged.
• the pleat legs of the at least five pleats have lines of inflection which run essentially straight.
• the fold In contrast to a curved inflexion line, which causes the fold to be stabilized, the fold remains unstiffened by a substantially straight inflexion line.
• the pleat legs may be formed such that they are not stabilized in shape.
• the vacuum cleaner filter bag remains flexible and the folds can better adapt to the space of a vacuum cleaner.
• the at least five folds form at least one surface fold, wherein the maximum height of the surface fold before the first start of the vacuum cleaner filter bag in a vacuum cleaner is smaller than the maximum height corresponding maximum width of surface folding. How the terms maximum height and maximum width are to be measured here is explained in detail below.
• a vacuum cleaner filter bag may also be provided in which, prior to the first use of the vacuum cleaner filter bag in a vacuum cleaner, each of the at least five pleats has a length greater than one third of the total extent of the vacuum cleaner filter bag in the direction the crease is preferably greater than half the total extension of the vacuum cleaner filter bag in the direction of the crease, and most preferably equal to the total expansion of the bag in the direction of the crease.
• the folds, in particular the fold axes, of the nonwoven material from a first side of the vacuum cleaner filter bag formed by the edge or the seam to a second, opposite to the first side, formed by the edge or the seam. the side of the vacuum cleaner filter bag run.
• An edge or a seam of the vacuum cleaner filter bag can in this case be formed in particular by a welded seam.
• the folds, in particular fold axes, of the nonwoven material can in this case be formed in a straight line.
• the fold axes of the folds may also be formed such that they have no area in which the nonwoven material is fused, welded or plasticized in any form, in particular that they are not formed by a weld.
• the folds of the first and / or second bag wall can have a pleat height between 3 mm and 100 mm, in particular between 3 mm and 50 mm, in particular between 5 mm and 15 mm.
• the pleat height can also be greater than 100 mm. This may be the case in particular for large (volume of more than 10 liters), in particular commercially used, vacuum cleaner filter bags.
• the folds of the first and / or second bag wall can also have a fold width between 3 mm and 100 mm, in particular between 3 mm and 50 mm, in particular between 5 mm and 15 mm.
• the fold width can also be greater than 100 mm. This may be the case in particular for large (volume of more than 10 liters), in particular commercially used, vacuum cleaner filter bags.
• At least two folds of the first and / or second bag wall may have a different fold height and / or fold width and / or fold shape.
• several or all folds of the first and / or second bag wall may have the same pleat heights and / or pleat widths.
• Another development of the invention provides that a plurality of folds is provided, which are distributed over the first and / or second bag wall, preferably substantially uniformly.
• the vacuum cleaner filter bag may also include a side fold in addition to the surface fold on the first and / or second bag walls.
• a particularly preferred side folding results when the bag wall regions from which this side fold is formed also have folds which preferably extend at an angle greater than 45 °, most preferably at a substantially right angle, to the side fold.
• the entire filter material can be provided with folds or folds, without the areas from which the side fold is to be formed, must be excluded from this.
• the folds and folds of the first and / or second bag wall can have any desired shape.
• the pleat legs can also be curved.
• a preferred folding is the so-called dovetail folding.
• a folding with dovetail shape is to be understood in particular as a sequence of four folds with the following configuration.
• the first leg of the first fold and the second leg of the fourth fold are parallel to the bag wall, as well as the second leg of the second fold, which is identical to the first leg of the third fold, parallel to the bag wall.
• the second leg of the first fold is identical to the first leg of the second fold and the second leg of the third fold is identical to the first leg of the fourth fold.
• the folds or folds of the first and / or second bag wall may each comprise differently long pleat legs.
• An edge at which the pleat legs meet, in particular the pleat axis, can be formed by a fold line.
• nonwoven material a dry-laid or wet-laid nonwoven fabric or an extrusion fabric, in particular a melt-spun microfiber spunbonded nonwoven fabric or spunbonded nonwoven spunbonded fabric may be used. There may also be additional nanofiber layers.
• wet laid nonwovens and conventional wet laid paper is made according to the definition given below, as used by the International Association Serving the Nonwoven and Related Industries (EDANA).
• EDANA International Association Serving the Nonwoven and Related Industries
• the nonwoven fabric may comprise staple fibers or continuous fibers. Manufacturing technology can also provide several layers of staple fibers or continuous fibers, which are solidified to exactly one layer of nonwoven fabric.
• the bag wall in particular the folded nonwoven material, may comprise a laminate of spunbond nonwoven fabric and nonwoven nonwoven fabric (SMS, SMMS or SnxMS).
• This laminate may be laminated or calendered by means of a hot melt adhesive.
• the layer of meltblown nonwoven fabric may be creped.
• nonwoven is used in accordance with the definition according to ISO standard ISO 9092: 1988 or CEN standard EN 29092.
• nonwoven fabric or nonwoven and nonwoven fabric in the field of production of nonwovens are delimited as follows and also in the For the production of a nonwoven fabric fibers and / or filaments are used.
• the loose or loose and still unconnected fibers and / or filaments are referred to as nonwoven or nonwoven fabric (Web) formed by a so-called Vliesbinde suits
• nonwoven fabric is a nonwoven having sufficient strength to be wound up into rolls, in other words, a nonwoven fabric becomes self-supporting by solidification.
• the nonwoven material may have (before the pleats are introduced) for vacuum cleaner filter bags for household use a basis weight of less than 250 g / m 2 , in particular less than 200 g / m 2 , in particular between 25 g / m 2 and 150 g / m 2 .
• the nonwoven material (before the folds are introduced) also have a basis weight of about 250 g / m 2. Depending on the mechanical requirement, this may be advantageous, in particular for commercial vacuum cleaner filter bags.
• a fixing device can be provided which prevents at least one of the at least five folds from fully unfolding.
• the folds of a bag wall can be at least partially connected to one another by means of a fixing device.
• a fixing device By means of the fixing device, it is also possible to keep folds of the first and / or second bag wall at a predetermined distance from one another.
• the fixing device may comprise at least one strip of material, in particular a non-woven material strip, or consist of at least one strip of material, in particular at least one strip of non-woven material. Several strips of material may be spaced apart from each other or directly adjacent to each other.
• Several strips of material may run transversely, in particular perpendicularly or at a predetermined angle, to the longitudinal direction of the folds.
• the predetermined angle may be greater than 0 ° and less than 180 °, in particular greater than 30 ° and less than 150 °.
• the fixing device is preferably arranged on the inflow side with respect to the bag wall.
• On the inflow side here means facing the interior of the vacuum cleaner filter bag.
• the fixing device may be at least partially connected to the bag wall, in particular with the folds of the first and / or second bag wall, in particular directly connected, in particular adhesively bonded and / or welded.
• the fixing device can be glued and / or welded at locations where fold limbs of two different folds of the first and / or second pouch wall adjoin one another.
• the fixing device can be glued and / or welded to the bag wall in one or more regions of the bag wall, which are each arranged between two folds of the first and / or second bag wall. In particular, in lying creases that do not overlap each other, thereby a simple production of the vacuum cleaner filter bag can be achieved. It is also possible for two or more folds of the first and / or second bag wall to be connected to one another by the fixing device, while two or more folds of the first and / or second bag wall are not connected to one another by the fixing device.
• the fixing device can be glued and / or welded to one or more folds of a bag wall in such a way that the connection is released during operation of the vacuum cleaner filter bag. This can be influenced by the at least partially releasing fixing the air flow within the vacuum cleaner filter bag. In other words, parts of the fixing device can serve as an air distributor during operation of the vacuum cleaner filter bag.
• the vacuum cleaner filter bag can comprise at least one element for flow deflection or flow distribution in the vacuum cleaner filter bag, in particular where the element can move in the air flow of the air flowing into the vacuum cleaner filter bag.
• an element is known, for example, from EP 1 787 560 or EP 1 804 635.
• such an element may be in the form of at least one strip of material attached to the bag wall inside the vacuum cleaner filter bag, or may comprise such a strip of material.
• such an element may correspond to at least one strip of nonwoven fabric or filter paper or at least comprise a strip of nonwoven fabric or filter paper.
• the at least one strip of material may be at least partially slotted.
• such an element may be in the form of at least one strip of material attached to a side of the bag wall opposite the inflow opening of the vacuum cleaner filter bag, inside the vacuum cleaner filter bag.
• the at least one strip of material may, in particular directly, be connected to the folded bag wall. It can thereby be achieved that the at least one strip of material can move well in the air flow of the air flowing into the vacuum cleaner filter bag, since the air can reach at least one fold under the at least one strip of material via the pleated core.
• the fixing device may be designed such that the fold width and / or the spacing of the folds or folds which are connected to one another by the fixing device, is kept substantially constant during operation of the vacuum cleaner filter bag.
• the fixing device may have a predetermined expansion behavior. As a result, a better adaptation of the vacuum cleaner filter bag can be achieved during operation on the available space in the vacuum cleaner.
• a predetermined expansion behavior is understood to mean that the length of the fixing device is changeable, in particular enlargeable, in the pulling direction of an engaging force.
• the fixing device can be designed such that the width of the folds or folds and / or their distance from each other during operation of the bag by changing an extension of the fixing device in at least one direction, in particular in a direction perpendicular to the longitudinal direction of the folds, can be increased. It can thereby be achieved that, during operation, the vacuum cleaner filter bag can make the best possible use of the space available in the vacuum cleaner.
• the change in the extent may correspond in particular to an increase in the extent or length of the fixing device.
• the change in expansion can be achieved by stretching the material of the fixing device.
• the change in the extent can be achieved by a geometric deformation of the fixing device.
• the fixing device may be in the form of a net, wherein the shape or geometry of the meshes of the net can be changed under tensile load.
• the fixing device may also be creped, wherein the creping runs parallel to the folds of the first and / or second bag wall. As a result, a change in the extent of the fixing device can be achieved during operation of the vacuum cleaner filter bag.
• the fixing device can also be at least partially folded, in particular wherein the folds run parallel to the folds of the first and / or second bag wall.
• the fold height of the folds of the fixing device can be used to determine the change in the extent of the fixing device to be achieved.
• the fixing device may have an elasticity which is selected such that the fixing device after operation of the vacuum cleaner filter bag, so after switching off the Vacuum cleaner, returns to its original shape. As a result, the change in the extent of the fixing device can be made reversible.
• the fixing device may also be partially, in particular in sub-areas, formed by stretchable strips of material and partially, in particular in other sub-areas, by non-stretchable strips of material.
• the vacuum cleaner filter bag can be adapted to the installation space of a vacuum cleaner.
• the material of the fixing device may have a high air permeability. If the material of the fixing device is impermeable to air, the fixing device may be perforated and / or slotted.
• the fixing device may be in the form of at least one continuous adhesive strip.
• the adhesive in particular, a hot melt adhesive (hot melt) can be used.
• the fixing device can be executed in the form of a continuous or interrupted weld.
• the at least one strip of material may have a width of 0.5 cm to 4 cm, in particular of 1 cm to 3 cm, for example 2 cm.
• the at least one strip of material may have a thickness of 0.1 mm to 10 mm, in particular of 0.3 mm to 4 mm.
• the fixing device may be in the form of one or two strips of material whose width and / or length correspond to the width and / or length of the bag wall. In other words, the fixing device can be formed over the entire surface.
• the fixing device may comprise a nonwoven material, a film and / or a paper.
• nonwoven material for the fixing device for example, filament spunbonded nonwoven fabrics, carded or airlaid nonwoven fabrics and / or laminates of a plurality of nonwoven fabrics are possible.
• the different nonwoven fabric layers may have a gradient in pore diameter.
• the fixing device can also be designed in the form of a fabric or a net.
• the fixing device may be in the form of an extruded net.
• the mesh size of the network can be between 0.5 mm and 10 cm, in particular between 3 mm and 6 mm.
• the shape of the holes of the net can be quadratic be table or rectangular.
• One or more holes of the mesh may be square and one or more holes of the mesh may be rectangular.
• the fixing device may also comprise filaments, tows and / or yarns.
• the fixing device may be arranged parallel to the bag wall, in particular parallel to an outer surface of the bag wall.
• the outer surface of the bag wall can be understood here a surface in which lie the fold axes of the folds of the first and / or second bag wall, or a parallel to it surface.
• the fixing device may also correspond to or comprise a holding plate of the vacuum cleaner filter bag.
• the folds of the first and / or second bag wall may be at least partially connected to one another by means of the holding plate of the vacuum cleaner filter bag.
• a nonwoven material of the fixing device may (optionally before folding) have a weight per unit area of 5 g / m 2 to 250 g / m 2 .
• the fixing device can also be designed as a prefilter layer.
• the fixing device itself may be formed as a filter layer.
• the basis weight of the fixing device may be smaller than 200 g / m 2 .
• the fuser may correspond to a laminate of one or more filament spunbond webs and one or more meltblown microfiber spunbond webs, particularly wherein the at least one meltblown microfiber spunbond web comprises electrostatically charged fibers.
• fibers and / or Absorben- can be arranged in a cavity formed by the fixing device and the pleat legs of at least one fold of the nonwoven material (pleated core).
• the fibers may in particular be electrostatically charged fibers.
• a further filtering effect can be achieved.
• the fibers can be coated.
• absorbents for example, porous polymers and / or activated carbon can be used.
• Absorbents based on coated polymer fibers are disclosed, for example, by DE 10 2004 009 956 and EP 1 725 153.
• the porous polymer for example, the crosslinked SDVB (styrene-divinylbenzene) can be used.
• Absorbents which may also be used are impregnated activated carbon, functionalized carbon, hydrophobic zeolites, hydrophobic, porous polymers, bentonites and / or crystalline organometallic complexes.
• a nonwoven web of melt-spun microfiber spunbonded nonwoven fabric may already be deposited on an at least partially structured surface in the manufacturing process.
• a nonwoven web can be formed from a nonwoven material provided at least partly with folds.
• the bag wall in particular the folded nonwoven material and / or the fixing device may be at least partially charged electrostatically.
• the fibers of the nonwoven material may be electrostatically charged prior to solidification and / or the nonwoven fabric, ie after solidification.
• the electrostatic charge can be achieved, for example, by a corona process.
• the web or nonwoven web is centered in a distance of about 3.8 cm (1.5 inches) to 7.6 cm (3 inches) wide between two DC corona discharge electrodes.
• one of the electrodes can have a positive DC voltage of 20 to 30 kV while the second electrode has a negative DC voltage of 20 to 30 kV.
• the electrostatic charge may be generated according to the teaching of US 5,401,446.
• the vacuum cleaner filter bag may in particular be a disposable vacuum cleaner filter bag.
• the vacuum cleaner filter bag can be designed such that the space utilization of the vacuum cleaner filter bag during operation is greater than 65%, in particular greater than 80%.
• a fold in the sense of the present invention is defined in each case by two fold legs and a fold hinge.
• the length of the pleat hinge defines in such a fold the length of the pleat.
• a fold in the sense of the present invention is a sequence of two or more folds.
• a side fold is a sequence of folds in the area of the side edge of the vacuum cleaner filter bag.
• the seam along the respective side edge of the vacuum cleaner filter bag is in this case a part of one of the folds forming the side fold;
• the hem in the region of the respective side edge is a pleat hinge or the hem is almost completely in a pleat leg.
• a surface fold is a sequence of folds provided on the bag wall. Such surface folding is at best fixed by a part of the seam along a side edge. However, this part of the hem is neither a fold hinge nor a component of the pleat leg of one of the folds of the fold.
• the air permeability is determined according to DIN EN IS09237: 1995-12. In particular, a differential pressure of 200 Pa and a test area of 20 cm 2 are used .
• the air permeability tester FX3300 from Texttest AG was used to determine the air permeability.
• the basis weight is determined according to DIN EN 29073-1: 1992-08.
• DIN EN 29073-1: 1992-08 the method according to standard DIN EN ISO 9073-2: 1997-02 is used, method A being used.
• Penetration NaCl permeability
• 0.3 M sodium chloride is used at 86 L / min.
• the width of a multi-fold surface fold in the first and / or second pouch wall is defined for a given cross-section through the fold as a projection of the maximum extent of surface fold on the pouch wall plane.
• the height of a multi-pleated surface fold in the first and / or second bag walls is defined for a given cross-section through the fold as a projection of the maximum extent of surface fold to the normal to the bag wall plane.
• the maximum height of a surface fold is defined here as the greatest height of the surface fold along its entire length.
• the maximum width of a surface fold corresponding to the maximum height is the largest width having the surface fold in the plane containing the maximum height and perpendicular to the axis of the surface fold.
• FIGS. 13a to 13d Illustrative examples for determining the maximum height and the maximum width of a surface fold are given in FIGS. 13a to 13d. Shown in each case is a cross section through a surface fold in the plane in which the maximum height of the fold is along its length and which is perpendicular to the fold axis. In this cross section, the maximum height H max and the maximum width B max are shown.
• FIGS. 13a to 13c surface folds are shown whose maximum height is smaller than the maximum width;
• FIG. 13d shows a surface fold whose maximum height is greater than its maximum width.
• the folds shown in FIGS. 13a to 13d are all standing folds. A lying convolution would be obtained by letting go in the figure 13b as the height of the convolution H max to zero.
• the maximum usable volume of the dust chamber of the vacuum cleaner filter bag is determined in accordance with DIN EN 60312-1: 2009.
• the theoretical volume of the construction space of the vacuum cleaner can be calculated from geometric data of the installation space, in particular wherein the space between existing in the installation space ribs that serve the Support vacuum cleaner filter bag and to be spaced from the wall surface of the space of the vacuum cleaner, not to the theoretical volume is expected.
• the theoretical volume of the installation space can be determined, for example, by placing a surface in a computer model of the installation space by means of a computer, which surface rests on the inner wall surface of the installation space, in particular directly. If the installation space has ribs which serve to support the vacuum cleaner filter bag and to space it from the wall surface of the installation space of the vacuum cleaner, the surface may also correspond to a surface parallel to the inner wall surface, which rests on the upper edges of these ribs, in particular directly. The volume enclosed by this surface may correspond to the theoretical volume of the installation space.
• FIG. 1 shows an exemplary vacuum cleaner filter bag
• Figure 2 is an oblique view of an inside of an exemplary vacuum cleaner filter bag
• Figure 3 is an oblique view of an inside of another exemplary vacuum cleaner filter bag
• FIG. 4 shows a cross section through a partial region of an exemplary congestion-suction filter bag
• FIG. 6 shows a cross section through a partial region of another exemplary example
• FIG. 8 shows another exemplary vacuum cleaner filter bag with a side folding
• Figure 9 is an illustrative diagram showing the flow through the bag wall of exemplary vacuum cleaner filter bags as a function of the dust mass stored therein;
• Figures 10a and 10b show a cross section through a portion of an exemplary
• FIGS. 11a and 11b show a cross section through a partial region of a further exemplary congestion-suction filter bag
• FIGS. 12a to 12c show a cross section through side folds according to the prior art
• FIGS. 13a to 13d show a cross section through various folds to explain the concept of maximum fold height and maximum fold width.
• Figure 1 shows an exemplary vacuum cleaner filter bag in the form of a flat bag, in which for illustrative purposes, a page is shown open. In fact, there is a weld in the area of the page shown here.
• the exemplary vacuum cleaner filter bag of FIG. 1 comprises a first and a second bag wall of folded nonwoven material.
• the first and second bag walls are connected by four welds. In Figure 1, three of these four welds 120, 130, and 140 are shown.
• the folded nonwoven material comprises a plurality, in particular more than two, folds 101.
• the folds 101 form folds standing here.
• the exemplary vacuum cleaner filter bag of Figure 1 also includes an inflow opening 102 through which air to be cleaned can flow into the vacuum cleaner filter bag, and a holding plate 103, which serves to fix the vacuum cleaner filter bag in a chamber of a vacuum cleaner, and in the region of the inflow opening 102 has a through hole.
• the pleats 101 are formed in the exemplary vacuum cleaner filter bag of Figure 1 along the entire length of the vacuum cleaner filter bag. Depending on the orientation of the holding plate 103, the vacuum cleaner filter bag may have a longitudinal side and a broad side. The pleats 101 may extend along the longitudinal side or along the broad side, in particular along the entire longitudinal side or broad side.
• a portion 104 of the bag wall is free of wrinkles.
• folds of the first and / or second bag wall may also be located on the entire bag wall.
• the bag wall may in particular comprise two or more filter layers, wherein at least one layer comprises the folded nonwoven material.
• Figure 2 shows an oblique view of an inside of a bag wall of an exemplary vacuum cleaner filter bag.
• the pleats 201 of the nonwoven material are connected together in this example by a fixing device in the form of a plurality of strips of material 205.
• the pleats 201 are held by the strips of material 205 at a predetermined distance from each other.
• the fold width of the folds 201 is fixed by the material strips 205.
• the material strips 205 are connected at connection points 206 with the folds 201, in particular with an edge of the folds 201, for example glued or welded.
• the arrow 210 indicates the direction of flow of the air to be cleaned through the nonwoven material.
• the material strips 205 may, for example, have a width of 0.5 cm to 4 cm, in particular from 1 cm to 3 cm, for example 2 cm.
• the material strips 205 may comprise a nonwoven material.
• the nonwoven material may in particular comprise extrusion nonwoven fabric, for example a filament spunbonded nonwoven, and / or a carded or airlaid nonwoven fabric.
• the strips of material 205 may also comprise a laminate of a plurality of nonwoven fabrics, in particular a filament spunbonded nonwoven laminate - melt spun microfiber spunbond nonwoven - filament spunbond web.
• the basis weight of the material strips 205 can be less than 250 g / m 2 , in particular between 10 g / m 2 and 30 g / m 2 .
• Some of the connection points 206 may be formed such that the connection dissolves during operation of the vacuum cleaner filter bag. By the at least partially dissolved strips of material 205, the flow behavior of the air flowing into the bag can be influenced.
• the material strips 205 may also have a predetermined elongation behavior. Thus, a predetermined expansion of the bag can be achieved during operation.
• the material strips 205 may also have an elasticity, so that the expansion of the bag after operation, ie after switching off the vacuum cleaner, is reduced again by elastic restoring forces. This also allows dust to be carried from the bag wall to the interior of the vacuum cleaner filter bag.
• the fixing device can also be designed as a full-surface material strip.
• the fixing device may have a high air permeability, in particular more than 5000 l / (m z s).
• the fixing device may also comprise an air-permeable paper, tissue and / or a film.
• the fixing device can also be perforated and / or slotted.
• FIG. 3 shows an oblique view of an inner side of a bag wall of another exemplary vacuum cleaner filter bag.
• the fixing device is in the form of a net 307 which connects the folds 301 of the nonwoven material in a partial area of the surface. In other areas of the surface, the folds of the first and / or second bag walls are not connected by the fixing device.
• the arrow 310 indicates the direction of flow of the air to be cleaned through the nonwoven material.
• Figure 4 shows a cross section through a portion of the bag wall of an exemplary vacuum cleaner filter bag, wherein the cross section is perpendicular to the course of the folds of the first and / or second bag wall.
• Figure 4 shows a zig-zag fold of three folds 401 comprising seven folds I-VII.
• the pleats I, III, V and VII are connected to each other by a fixing device 405.
• the fixation Device 405 at connection points 406 connected to the fold hinges of these folds.
• the arrow 410 indicates the direction of flow of the air to be cleaned to the bag wall.
• the fixing device 405 is thus upstream with respect to the bag wall.
• FIG. 4 also shows the fold width B max and the fold height H max of the folds.
• the pleat height and / or the pleat width may be between 3 mm and 100 mm, in particular between 5 mm and 15 mm.
• the folds are standing folds; one part of the pleat legs in this case has an angle ⁇ of about 64 °, the other part of the pleat legs an angle ß of about 1 16 °.
• FIG. 5 shows a further cross section through part of a bag wall of an exemplary vacuum cleaner filter bag.
• two folds 501 from six folds I-VI are shown in the cut-out, and a fixing device 505 arranged upstream with respect to the inflow direction 510, which are connected at connection points 506 to the folds I, III or IV and VI.
• connection point 506.1 is arranged in the region of the nonwoven material which forms the leg of the folds III and IV and runs parallel to the bag wall.
• the folds of this vacuum cleaner bag thus have legs that are parallel to the bag wall and lie between the folds that protrude from the bag wall plane.
• the width of the parallel leg is smaller than the width of the opening of the protruding from the bag wall fold.
• the folds in cross-section are in the shape of isosceles triangles.
• the heights of these folds are therefore each smaller than the corresponding widths of the folds.
• FIG. 6, shows a cross section through a partial region of a bag wall of an exemplary vacuum cleaner filter bag, in which the folds 601 have pleat legs of different lengths in cross section.
• the cavities formed between the folds and the fixing device with fibers, in particular electrostatically charged fibers, and / or with Absorbents are filled.
• fibers in particular electrostatically charged fibers, and / or with Absorbents
• coated fibers, activated carbon and / or porous polymers can be used as absorbents.
• Figure 7 shows a cross section of a portion of such a bag wall.
• a plurality of folds 701 are shown forming triangular folds.
• a fixing device 705 is connected to a part of the folds.
• fibers 71 1 and / or activated carbon 712 are arranged in the cavities between the pleat legs and the fixing device 705 in the cavities between the pleat legs and the fixing device 705.
• Figure 8 shows an exemplary vacuum cleaner filter bag in the form of a flat bag in plan view of an outside of the vacuum cleaner filter bag.
• the upper and lower bag walls include a plurality of pleats 801.
• Reference numerals 820, 830 and 840 indicate three welds.
• one page is shown open in FIG. 8 for illustration purposes. In fact, in the area of the page shown here is also one, namely the fourth weld.
• the vacuum cleaner filter bag also includes two side folds 813 and 814. In the area of the side folds, the filter material is not folded.
• the gussets 813 and 814 are partially or completely ausstülpbar.
• the side folds may also comprise folded filter material.
• the folded filter material does not unfold when introducing the side folds, it is expedient to provide the side folds at an angle to the folds, which is greater than 45 °. If one starts from the vacuum cleaner filter bag shown in FIG. 8, in this case the side folding would have to be introduced in the region of the weld seam 820 and / or in the region of the weld seam (not shown).
• the folds have the shape of a triangle.
• the folds can also have any other shape.
• the shape of the folds in the figures is only to be understood schematically.
• the pleat legs can also be curved.
• the fold shape of one or more folds and / or folds of the first and / or second bag wall may have a dovetail shape in a cross section perpendicular to the longitudinal axis of the folds. Examples of folds with a dovetail cross-section are shown in FIGS. 10a and 10b.
• the to the inside of the bag Send edges 1015 of the pleat legs of the pleats 1001 are spaced from each other. This allows the air to be cleaned easily penetrate into the fold.
• the direction in which the air to be cleaned flows through the bag wall is illustrated by an arrow 1010.
• the pleats 1002 of the nonwoven material are respectively connected to the parallel legs of the pleats 1001, in particular adhesively bonded and / or welded.
• the connecting points 1016 have a distance to one another in the longitudinal direction of the pleats 1002 that is greater than 1/5, in particular greater than 1/4, the length of the pleat 1002.
• the pleats 1002 can be better flowed through the air to be cleaned during operation than at smaller distances between junctions 1016.
• connection points 1016 may also lie on a continuous welding line.
• a fixing device 105 is provided in the form of a plurality of strips of material which is adhesively bonded and / or welded to the folded legs of the folds 1001 with the at least folded nonwoven material.
• a plurality of connection points 1006 are shown in FIG. 10b.
• FIGS. 11a and 11b show further exemplary sections of a bag wall with a nonwoven material with surface folds.
• the folds of the pleats 1 101, 1 102 and 1 103 of the nonwoven material are formed lying in these examples, i. the pleat legs are substantially parallel to the surface of the bag wall. Since substantially parallel to the surface extending pleat legs are graphically not represented, the pleat legs were shown here at an angle with respect to the surface of the bag wall.
• FIG. 11a also shows a fixing device 1105 which is connected to the nonwoven material provided with surface folds in regions of the bag wall, in particular glued and / or welded, which form the pleat legs of the pleats 1110.
• a fixing device 1105 which is connected to the nonwoven material provided with surface folds in regions of the bag wall, in particular glued and / or welded, which form the pleat legs of the pleats 1110.
• FIGS. 11a and 11b the direction in which the air to be cleaned flows through the bag wall is also illustrated in the form of an arrow 1110.
• the fixing device 1 105 is formed in Figure 1 1 a over the entire surface.
• the fixing device 1 105 could also be in the form of several strips of material, as illustrated for example in Figure 2, be formed.
• connection points 1 106 can also be on a continuous welding line, which preferably runs parallel to the fold axes lie.
• the folds 1 101 of the nonwoven material are respectively connected to the fold limbs of the folds 1 102, in particular adhesively bonded and / or welded, which is arranged between two fold edges of the bag wall.
• the joints 1 1 16 have in the longitudinal direction of the folds 1 101 a distance from each other, which is greater than 1/5, in particular greater than 1/4, the length of the fold 1 101.
• the folds 1 101 can be better flowed through the air to be cleaned during operation than at smaller distances between the connection points 1 1 16.
• connection points 1 1 16 can also be on a continuous welding line, which preferably extends perpendicular to the fold axes lie.
• the area available for filtration can be increased at given dimensions of the vacuum cleaner filter bag. This leads to a high separation efficiency with low initial pressure loss. This is accompanied by a lower media passage speed, which increases the separation efficiency, in particular by electrostatically charged fibers of the bag wall.
• vacuum cleaner filter bag may be formed in different geometries and / or sizes. Measurement results
• FIG 9 is an illustration and shows a diagram in which the volume flow through the vacuum cleaner as a function of the dust load (DMT-8 dust) is shown in grams.
• the bag wall is an SMMS laminate, so each consists of an outer layer of spunbonded nonwoven (35 g / m 2 ) two layers of meltblown nonwoven fabric (2 x 20 g / m 2 ) and an inner layer of spunbonded fabric (17 g / m 2 ).
• the corresponding measurements were carried out with a vacuum cleaner of the model "Miele S 5210".
• Example 1 Flat bag according to the prior art. Bag dimensions: 300 mm x 320 mm.
• Example 2 Bag dimensions (length x width): 300 mm x 320 mm. On the top side of the bag and the underside of the bag there were continuous folds evenly distributed over the surface. In particular, the longitudinal folds on each of the bag sides were in the form of a zig-zag fold as shown in Figure 4 (but a fixing device as shown in Figure 4 was not yet used in this Example 2). The zig-zag folding had 20 open folds to the vacuum cleaner bag inside. The material width was 630 mm. The average height H max of the fold was 12 mm.
• Example 3 Bag dimensions (length x width): 300 mm x 320 mm. On the top of the bag and the bottom of the bag, the same fold as in Example 2 was provided. In addition, in this bag on the inside of the bag top and the bottom of the bag, a full-surface fixing device in the form of a mesh with a mesh size of 5 mm x 5 mm was present. This network was attached to 171 points corresponding to Fig. 3 on the filter medium.
• Example 4 Bag dimensions (length x width): 300 mm x 320 mm. On the top of the bag and the bottom of the bag, the same fold as in Example 2 was provided. In addition, in this bag on the inside of the bag top and the bottom of the bag there was a fixing device in the form of nine strips of 20 mm width. These strips were attached to the filter medium at 171 points as shown in FIG.
• Example 5 Bag dimensions (length x width): 300 mm x 320 mm. On the top of the bag and the bottom of the bag, the same fold as in Example 2 was provided. In addition, in this bag on the inside of the bag top and the bottom of the bag there was a fixing device in the form of nine strips of 20 mm width. These stripes were attached to 171 points corresponding to FIG. 2 on the filter medium. The bag also had an element for flow diversion. This consisted of 14 strips of 1 1 mm each with a basis weight of 1 10 g / m 2 . The strips ran parallel to the folds of the top and bottom of the bag.
• the vacuum cleaner filter bags with a bag wall comprising a folded nonwoven material exhibit a larger volume flow even at high dust loads than a vacuum cleaner filter bag with a bag wall without folds in the nonwoven material.
• the higher dust storage capacity reduces the pressure loss increase of the vacuum cleaner filter bag.
• Filter medium 1 is an SMMS laminate of an outer layer of spunbonded nonwoven (35 g / m 2 ) two layers of meltblown nonwoven fabric (2 x 20 g / m 2 ) and an inner layer of spunbonded fabric (17 g / m 2 ).
• Filter medium 2 is a SMMMMS laminate of an outer layer of spunbonded non-woven (35 g / m 2 ) four layers of meltblown nonwoven fabric (4 x 19 g / m 2 ) and an inner layer of spunbonded fabric (17 g / m 2 ).
• the different media transit speeds were set by changing the volume flow on the TSI 8130. It was worked with test specimens with an area of 100 cm 2 .
• the pressure loss and the penetration in the filter medium and the flow rate corresponding to a folded bag wall are significantly lower than the filter medium and the flow rate corresponding to the prior art (unfolded).
• the pressure loss is only half as high for both filter media considered as for the high media throughput speed.
• the separation efficiency improves markedly at the lower rate of penetration.
• the reduction in the penetration is disproportionately greater in the filter medium 2 than in the filter medium 1, because in this case the effect of the electrostatic charge of the filter material comes to bear even more than in the more open material. 1
• an optimal adaptation of the vacuum cleaner filter bag during operation to the predetermined installation space in the vacuum cleaner can be achieved.
• a space utilization of more than 65% can be achieved.
• a space utilization of more than 80% can be achieved.

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